chore: remove .tool-versions and move plan loop script

- .tool-versions removed (using system Node)
- run-plan-loop.sh moved to ~/.local/bin/agl

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

.tool-versions

@@ -1 +0,0 @@
-nodejs 25.2.1

scripts/run-plan-loop.sh

@@ -1,43 +0,0 @@
-#!/usr/bin/env bash
-set -euo pipefail
-
-PLAN_FILE=${1:-plan.md}
-if [[ ! -f "$PLAN_FILE" ]]; then
-  echo "Plan file not found: $PLAN_FILE" >&2
-  exit 1
-fi
-
-REPO_ROOT=$(cd "$(dirname "$PLAN_FILE")" && pwd)
-PLAN_PATH="$REPO_ROOT/$(basename "$PLAN_FILE")"
-IMPLEMENT_PROMPT=$(cat <<EOF2
-You are Codex working in $REPO_ROOT.
-1. Read the checklist at $PLAN_PATH.
-2. Implement the very first unchecked task (top-most "- [ ]" entry) completely. Do not skip around.
-3. After finishing the work, update $PLAN_PATH:
-   - Change that task marker to "- [x]".
-   - Under that list item add an indented bullet summarizing the work/tests/follow-ups.
-4. Stop immediately after completing that single task.
-EOF2
-)
-REVIEW_PROMPT=$(cat <<EOF3
-You are Codex acting as a reviewer.
-1. Read $PLAN_PATH and inspect the repository.
-2. Review the work completed in the prior step: hunt for duplicate code, missing types, bugs, regressions, or corners that were cut.
-3. If something is wrong, fix it or add new checklist items describing the follow-up.
-4. Reorder or uncheck tasks when needed and always add context lines so we know what changed.
-5. Stop after updating $PLAN_PATH with your findings (new tasks, reopened ones, etc.).
-EOF3
-)
-
-iteration=1
-while grep -q '\- \[ \]' "$PLAN_PATH"; do
-  echo "=== Iteration $iteration: implement next task ==="
-  codex exec --dangerously-bypass-approvals-and-sandbox -C "$REPO_ROOT" "$IMPLEMENT_PROMPT"
-
-  echo "=== Iteration $iteration: review & adjust plan ==="
-  codex exec --dangerously-bypass-approvals-and-sandbox -C "$REPO_ROOT" "$REVIEW_PROMPT"
-
-  iteration=$((iteration + 1))
-done
-
-echo "All tasks in $PLAN_PATH are complete."